Steven Sinofsky and Microsoft announced recently that Steven will be leaving the company effective immediately. Steven was the President of Microsoft’sWindows and Windows Live division and will be replaced by the lead of Windows software and hardware engineering, Julie Larson-Green.

Below is his open letter to Microsoft employees and below that is Microsoft’s press release.

With the general availability of Windows 8/RT and Surface, I have decided it is time for me to take a step back from my responsibilities at Microsoft. I’ve always advocated using the break between product cycles as an opportunity to reflect and to look ahead, and that applies to me too.

After more than 23 years working on a wide range of Microsoft products, I have decided to leave the company to seek new opportunities that build on these experiences. My passion for building products is as strong as ever and I look forward focusing my energy and creativity along similar lines.

The Windows team, in partnerships across all of Microsoft and our industry, just completed products and services introducing a new era of Windows computing. It is an incredible experience to be part of a generational change in a unique product like Windows, one accomplished with an undeniable elegance. Building on Windows, Surface excels in design and utility for a new era of PCs. With the Store, Internet Explorer, Outlook.com, SkyDrive and more, each of which lead the way, this experience is connected to amazing cloud services.

It is inspiring to think of these efforts making their way into the hands of Microsoft’s next billion customers. We can reflect on this project as a remarkable achievement for each of us and for the team. Our work is not done, such is the world of technology, and so much more is in store for customers.

It is impossible to count the blessings I have received over my years at Microsoft. I am humbled by the professionalism and generosity of everyone I have had the good fortune to work with at this awesome company. I am beyond grateful.

I have always promised myself when the right time came for me to change course, I would be brief, unlike one of my infamous short blog posts, and strive to be less memorable than the products and teams with which I have been proudly and humbly associated. The brevity of this announcement is simply a feature.

Some might notice a bit of chatter speculating about this decision or timing. I can assure you that none could be true as this was a personal and private choice that in no way reflects any speculation or theories one might read—about me, opportunity, the company or its leadership.

As I’ve always believed in making space for new leaders as quickly as possible, this announcement is effective immediately and I will assist however needed with the transition.

I am super excited for what the future holds for the team and Microsoft.

With my deepest appreciation,

Steven Sinofsky

Sent from Surface RT

Press Release:

REDMOND, Wash. — Nov. 12, 2012 — Microsoft Corp. today announced that Windows and Windows Live President Steven Sinofsky will be leaving the company and that Julie Larson-Green will be promoted to lead all Windows software and hardware engineering. Tami Reller retains her roles as chief financial officer and chief marketing officer and will assume responsibility for the business of Windows. Both executives will report directly to Microsoft CEO Steve Ballmer.

These changes are effective immediately.

“I am grateful for the many years of work that Steven has contributed to the company,” Ballmer said. “The products and services we have delivered to the market in the past few months mark the launch of a new era at Microsoft. We’ve built an incredible foundation with new releases of Microsoft Office, Windows 8, Windows Phone 8, Microsoft Surface, Windows Server 2012 and ‘Halo 4,’ and great integration of services such as Bing, Skype and Xbox across all our products. To continue this success it is imperative that we continue to drive alignment across all Microsoft teams, and have more integrated and rapid development cycles for our offerings.”

“It is impossible to count the blessings I have received over my years at Microsoft. I am humbled by the professionalism and generosity of everyone I have had the good fortune to work with at this awesome company,” Sinofsky said.

Since 1993, Larson-Green has worked on and led some of the most successful products for Microsoft, including the user experiences for early versions of Internet Explorer, and helped drive the thinking behind the refresh of the user experience for Microsoft Office. For Windows 7 and Windows 8 she was responsible for program management, user interface design and research, as well as development of all international releases. She has a master’s degree in software engineering from Seattle University and a bachelor’s degree in business administration from Western Washington University. In her new role she will be responsible for all future Windows product development in addition to future hardware opportunities.

“Leading Windows engineering is an incredible challenge and opportunity, and as I looked at the technical and business skills required to continue our Windows trajectory — great communication skills, a proven ability to work across product groups, strong design, deep technical expertise, and a history of anticipating and meeting customer needs — it was clear to me that Julie is the best possible person for this job, and I’m excited to have her in this role,” Ballmer said.

Reller joined Windows in 2007 from the Microsoft Dynamics Division where she held a number of leadership positions. She began her career in technology at Great Plains Software in 1984 while still in college, and was the company’s chief financial officer at the time the company was acquired by Microsoft in 2001. She has a bachelor’s degree in mathematics from Minnesota State University Moorhead and an MBA from St. Mary’s College in Moraga, Calif. In her expanded role she will assume the lead in driving business and marketing strategy for Windows devices, including Surface and partner devices, in addition to her current marketing and finance responsibilities.

Founded in 1975, Microsoft (Nasdaq “MSFT”) is the worldwide leader in software, services and solutions that help people and businesses realize their full potential.